Stool



FIG. 1 is a front, top, left perspective view of a stool showing my design therefor;

FIG. 2 is a bottom rear right perspective view thereof;

FIG. 3 is a front elevational view thereof, both sides and rear views being identical;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM The ornamental design for a stool, as shown and described. 